Simulation for UCC28C43

watanabe

Expert 1740 points

Other Parts Discussed in Thread: UCC28C43

Hi,

It was designed UCC28C43 in WEBENCH,
It oscillates at a default of a circuit diagram.

(URL:webench.ti.com/.../SDP.cgi

When the C13 capacitor below 10nF more than 1nF,
Oscillation has subsided.

I want to add a function to display the loop characteristics in WEBENCH.
In addition, I want to be able to switch between CCMMode and DCMMode.

Regards,

Watanabe

over 7 years ago

0 Gerold Dhanabalan - Online Design Tools over 7 years ago

TI__Genius 14455 points

Hi Watanabe,

Currently the UCC28C43 is designed to be in CCM Mode only. When you tested the circuit, did you simulate the circuit in PSpice or was it done in any other tool? I could not open the design that you sent. Can u please let us know the input, output conditions of the design and any changes if you made to the default design?

Regards,

Gerold

0 watanabe over 7 years ago in reply to Gerold Dhanabalan - Online Design Tools

Expert 1740 points

Hi Gerold,

I appreciate for your support.

I understand the CCM mode only.
My customer do not have simulation by other tools.

URL was designed UCC28C43 in the default condition.
AC:60Hz
VinRMS:85~265V
Vout:12V
Iout:4A
Ambient Temp:30

The problem of the oscillation has been resolved.
Gist of this question is a request of additional functions for the WEBENCH.

Best Regards,
-Watanabe

0 Gerold Dhanabalan - Online Design Tools over 7 years ago in reply to watanabe

TI__Genius 14455 points

Hi Watanabe,

How did you find out about the oscillation? Did you put these components on the board? If so, what was your reference board and did you put all the components recommended by WEBENCH on the board?

regards,

Gerold

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Simulation for UCC28C43